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U-Channel Extension Posts

I used as extension posts on 2 other already installed 8' posts to get the proper height of 80" from the ground to the bottom edge of each sign. Used as extension posts, the provided bolts and nuts stuck out too far from the posts. For safety purposes, I used 5/16 x 1" bolts instead and used three sets of bolts and nuts for the top, middle and bottom of each extension post.